[R] Applying interpolation within a convex hull

[sam.e]

Hi there, 

I have been using the Tps function (within the Fields package) for a while
now to interpolate different sedimentary units. Due to the method of
formation of the units I know that at some edges the thickness of the unit
decreases to zero. I was wondering if there was someway to specify that the
interpolation only occurs within the convex hull of the data, outside of
which the the values are zero. I am having problems with the output surface
'curling' up at distance from the data.

Thanks, 
Sam

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